Changing the teflon coupler?

[braddock 1]

Hi guys, I blew the dust off the UM2 to do some prints last week, and have been having nothing but failed prints, all due to under extrusion.

I have some spare couplers, so might as well change it out, but before I do, are there any instructuions on how to do it? I've never pulled the nozzle apart before.

I did do a search, but it's didnt give me a specific topic on the subject.

Cheers.

 

[braddock 1]

oh... just found this thread

http://umforum.ultimaker.com/index.php?/topic/8632-atomic-cleaning-the-teflon-ring/

 

 

[DidierKlein 729]

This video shows how to:

Just stop at the part where you take the teflon out

 

[braddock 1]

says here they've improved the coupler... what's the difference?

https://ultimaker.com/en/products/spare-parts

 

 

[DidierKlein 729]

The new coupler is infilled with 25% of glassfill to make it more resistant

If you have old couplers at home they will still do the job don't worry

 

[gr5 1,858]

That above video has you take off the 3rd fan. This is completely unnecessary - just skip that step.

 

[braddock 1]

Ok, thanks guys. Is the new glass filled coupler supposed to last longer? or will it eventually need changing too?

 

 

[IRobertI 502]

It too, will need changing eventually.

 

[tinydancer 0]

Check out post #20 of this thread for a pic of the correct gap.

http://umforum.ultimaker.com/index.php?/topic/8513-underextrusion-need-help-with-this-one/

 

[stu_le_brew 40]

....

question 1, is it time to get a replacement teflon coupler?

question 2, when was the new coupler material introduced?

 

Q1 it probably is worth looking at it to check for wear and deformation, my last one lasted about 600 hours, but it depends on what print material you have been using. Higher temp material seems to cause more wear

Q2 new teflon coupler was introduced last spring (April/May) last year

I would also recommend its time for lubrication of all the rods too, I use thin oil on a cloth for the rods and grease for the Z axis

 

[ultiarjan 1,215]

If you printed 1000 hrs don't be bothered with repairing the coupler, just replace it, its a (relatively) cheap consumable ...

 

[tinydancer 0]

Yes, I would bet money your teflon coupler is toast so just replace it.

 

[tinydancer 0]

I would stick with what is displayed in that thread I linked.. And we would have to see pics of the coupler to tell you if it's salvageable. Given the amount of hours you have on it, that's highly unlikely.